Please please help me

So my last period was Dec.25 ( I believe). I was late on my period so I took a test a cheap dollar store one and it came back positive . I then went and bought the more expensive brands both digital and non-digital and both came out positive as well . I scheduled my appt to see a doctor and it was set at my 8 week mark . Tonight I sat down to pee and took another test . As I sat down the test I felt a gush and look down to see blood . I got scared and called my doctor who then proceeded to tell me to go get checked . I looked at the test and it said positive. When I arrived at the urgent care facility they informed me that they didn’t have any obgyn doctors that they were actually a surgical urgent care . They brought in a lady to do ultrasounds on me and I did a pee and blood test. 3 hours later after all the test they came in to tell me I am not pregnant and that all he tests came out negative including the ultrasounds (both outside and vaginal ultrasounds). I am in shock and can’t understand what is happening . All 4 pregnancy tests came out positive and then then they tell me I’m not pregnant ? Does anyone have any experience with this or know what may have caused all this ? I’m desperate to feel better right now .